1.

In a class the average age of 30 students is 15 years. If the teacher is included then the average age is increased by one year. Find the age of the teacher.(a) 40 years (b) 45 years(c) 46 years (d) 48 years

Answer»

Average = ( SUM of quantities ) / ( number of quantities )



Now,

15 = ( sum of 30 ages ) / 30

450 = sum of 30 ages





When the AGE of TEACHER is included, average increases by 1

ATQ,


16 = ( 450 + age of teacher ) / 31

496 = 450 +age of teacher

46 = age of teacher





Option is correct.



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